package com.mask.juc.v1.c_010;

import java.util.concurrent.CountDownLatch;

/**
 * @author hx
 * @date 2021/10/12 4:20 下午
 */

public class T_TestCountDownLatch {
    public static void main(String[] args) {
        usingCountDownLatch();
        usingJoin();
    }

    private static void usingCountDownLatch(){
        Thread[] threads = new Thread[100];
        CountDownLatch latch = new CountDownLatch(threads.length);
        for (int i = 0; i < threads.length; i++) {
            threads[i] = new Thread(() -> {
               int result = 0;
                for (int j = 0; j < 10000; j++) {
                    result += j;
                }
            });
        }
        for (int i = 0; i < threads.length; i++) {
            threads[i].start();
        }

        try {
            latch.wait();
        }catch (InterruptedException e){
            e.printStackTrace();
        }
        System.out.println("end latch");
    }

    private static void usingJoin(){
        Thread[] threads = new Thread[100];
        for (int i = 0; i < threads.length; i++) {
            threads[i] = new Thread(() -> {
               int result = 0;
                for (int j = 0; j < 10000; j++) {
                    result += j;
                }
            });
        }
        for (int i = 0; i < threads.length; i++) {
            threads[i].start();
        }
        for (int i = 0; i < threads.length; i++) {
            try {
                threads[i].join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println("end join");
    }
}
